Tension device for loom-shuttles



(No Model.)

J. J. DONOVAN. TENSION DEVICE FOR LOOM SHUTTLES. No. 600,520.

Patented Mar. 15, 1898.

UNirne STATES ATENT OFFICE.

JOHN J. DONOVAN, OF LOIVELL, MASSACHUSETTS.

TENSION DEVICE FOR LOOM-SHUTTLES.

SPECIFICATION forming part of Letters Patent No. 600,520, dated March 15, 1898.

Application filed June 22, 1896.

To aZZ whom 2325 may concern:

Be it known that I, J OHN J. DONOVAN, a citizen of the United States, residing at Lowell, in the county of Middlesex and Commonwealth of Massachusetts, have invented a certain new and useful Improvement in Loom Shuttles, of which the following is a specification.

My invention relates to loom-shuttles; and it consists in the devices and combinations hereinafter described and claimed for regulating the tension of the thread or yarn and of equalizing said tension irrespective of the direction in which the shuttle is traveling.

In the accompanying drawings, Figure 1 is a rear elevation of a shuttle provided with my invention; Fig. 2, a plan of the same with a bobbin and cop; Fig. 3, a plan of the same, partly in horizontal section, on the line 3 3 in Fig. 4:; Fig. i, a front elevation of said shuttle; Fig. 5, a vertical cross-section of said shuttle on the line 5 5 in Fig. 2.

A represents the shuttle-body, provided with a longitudinal guide-groove a in front; B B, the tips; C, the spindle, arranged within the chamber a; D, a bobbin carrying a cop E, these parts being all of the usual construction and operation.

From the cop E the yarn or thread is carried through the usual throat a or narrow continuation of the chamber a to my improved tension devices, whichconsist of a cylinder F, which crosses the throat a horizontally at about half-way between the top and the bottom of the shuttle, and is retained in the body of the shuttle and prevented from accidental turning therein by friction or by a screw-threadf, which may be cut on the inner end portion of said cylinder. extends diametrically through said cylinder to receive the thread, which passes through said hole f and into a cavity G, arranged below said cylinder, and between the same and the adjacent tip 15 and thence through a passage I-I, which leads from said cavity G into the guide-groove a and through the deliveryeye h, the latter being of any usual material and construction.

The ends of the hole or thread-passage f are rounded out, as shown at f f in Fig. 5, to avoid fraying the thread, and the cylinder A hole f.

Serial No- 596,385. (No model.)

F may be turned by a screw-driver inserted in a slot f, with which the rear or outer end of said cylinderis provided, as shown in Figs. 1, 2, and 3, to increase or diminish the angles at which the thread enters and leaves said thread-passage f, and thereby to increase or diminish the tension of said thread, as maybe desired.

The passage H is inclined to the longitudinal axis of the shuttle from the cavity G toward the middle of the shuttle to equalize the friction of the thread as the shuttle alternately moves in opposite directions, the longer contact-surface and consequently the greater friction of the thread on the front of the shuttle as the shuttle moves in one direction (to the right in Fig. 3) being compensated by the greater angle which the passage H makes with the face of the shuttle on the left (in said Fig. 3) of said passage, while the thread after passing the sharper angle between the opposite side of said passage H and said face has much less contact with the shuttle.

It Will be apparent from the foregoing description that the cylinder F is a compound tension-piece producing a variable tension on the thread at two points-that is, where said thread enters and where it leaves said cylinder or tension-piecein addition to the uniform tension caused by the friction of the delivery-eye it upon said thread.

I claim as my invention- A loom shuttle, provided with a rotary cylindrical tension-piece, arranged horizontally and transversely and having a diametrical hole or thread-passage extending entirely through said tension-piece with a cavity, arranged below said tension-piece, and with a thread-passage, leading from said cavity to the face of said shuttle, to vary the tension of a thread carried by said shuttle by Varying the angles at which said thread enters and leaves said tension-piece.

In Witness whereof I have signed this specification, in the presence of two attesting witnesses, this 12th day of June, A. D. 1896.

JOHN J. DONOVAN.

WVitnesses:

ALBERT M. MOORE, GEORGE M. IIARRIGAN. 

